The voracious fire's giant flames -- which forced evacuations of the Cascade, Green Mountain Falls and Chipita Park communities near 14,115-foot Pikes Peak in the Front Range of the Rocky Mountains -- were fueled by a triple-digit four-day heat wave, relative-humidity levels near zero and sustained hot winds of 10 mph to 20 mph and gusts of up to 35 mph, the National Weather Service said.

This combination will create "explosive fire growth potential," the service said, as it also issued a red flag warning of imminent fire danger for most of the state through 9 p.m. MDT (11 p.m. EDT) Tuesday.

Gov. John Hickenlooper issued a statewide ban on open burning and a ban on personal fireworks ahead of next week's Fourth of July holiday.

Temperatures were forecast to reach 100 degrees again Tuesday and remain in the upper 90s during the day through Saturday, AccuWeather forecast.

Lightning strikes were forecast in tinder-dry areas, the weather service said.

Rain was not due until July 4 or 5.

About 600 firefighters battled the Waldo Canyon fire -- one of a half-dozen large fires burning across the state's dry terrain in the worst wildfire season in a decade.

The High Park fire, burning for weeks near Fort Collins, has charred more than 83,000 acres and destroyed 248 homes.

That blaze -- one of the largest and most destructive in Colorado history -- is 45 percent contained.

The Waldo Canyon fire, which started Saturday, is 5 percent contained.

Wildfires are burning in much of the West.

In southwestern New Mexico, the largest wildfire in state history has burned about 300,000 acres.